Martha Raddatz reports on Pres. Trump's defense of his top intelligence officials following the extraordinary security breach in which they reportedly discussed a U.S. attack in Yemen on a commercial messaging app, with a journalist mistakenly included on the chat; Terry Moran has details on Russia and Ukraine agreeing to limit their attacks in the Black Sea, according to the White House; Matt Gutman has the latest on the newly released police body camera video showing the chaos that unfolded at an unsanctioned car show in Las Cruces, New Mexico after gunmen opened fire, killing three and wounding over a dozen; and more on tonight's broadcast of World News Tonight.